• 한국의류산업학회지
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• 제7권1호
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• pp.81-84
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• 2005

Skin patch test and antibacterial properties of the reaction products between poly(hexamethyl biguanide) hydrochloride and trimethylol melamine on textile fabrics were examined. Antibacterial activities of anti-microbial agent treated samples are very good. The reduction ratios against four kinds of colonies are 99.9 % after repeated laundering ten times. Skin patch test results for anti-microbial agent treated samples are almost-negative by Hi-scope judgement and macroscopical judgement.

• 한국포장학회지
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• 제4권1호
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• pp.33-40
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• 1997

The microbial growth of fresh, vacuum packaged, cook-in-bag uncured beef patties was determined in two film structures, a commercial (PE/EVOH), and super barrier ($SiO_2$ coated polyester) material. Packaged samples were cooked to internal temperature of 71 and $82^{\circ}C$ for 30 minutes, and stored in temperature abused ($23{\pm}2^{\circ}C$) and refrigerated storage ($4-6^{\circ}C$). Barrier properties had a significant effect (p<0.001) on aerobic and mesophilic growth in the abused condition. Cooking temperatures had a statistically significant effect (p<0.05) on aerobic growth in the refrigerated condition. The growth of anaerobes and psychrophiles were not significantly effected by either variables. Storage times had the most significant effect (p<0.001) for all groups of microorganisms. The physical properties of the commercial film (strength, thickness, and shrinkage) were changed after exposure to thermal treatment, while the super barrier package had actually no change.

• International Journal of Industrial Entomology and Biomaterials
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• 제34권2호
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• pp.32-37
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• 2017

The purpose of this study was (1) to demonstrate the anti-microbial properties of 4-hexylresorcinol (4HR) loaded silk mat and (2) comparison of bone formation between 4HR incorporated silk mat and collagen membrane. Anti-microbial properties of 4HR incorporated silk mat was done after sterilization of silk mat (autoclaving and ethylene oxide gas). For the evaluation of bone formation, bilateral bony defects (size: 8 mm) were prepared in the parietal bone of the rabbits (n=10). 4HR incorporated silk mat (size: $10{\times}10mm$) was applied on the right defect. For the comparative purpose, the same size of commercial collagen membrane was applied on the left defect. The anti-microbial properties of 4HR incorporated silk mat were maintained after sterilization process. When compared bone mineral density and bone volume, there was no statistically significant difference between groups at 4 weeks and 8 weeks after operation (p>0.05). In conclusion, 4HR incorporated silk mat could be autoclaved without concern of anti-microbial properties loss. In addition, 4HR incorporated silk mat showed similar bone regeneration to collagen membrane. Therefore, 4HR incorporated silk mat might be considered for the application of open membrane technique.

• 한국토양비료학회지
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• 제44권2호
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• pp.236-241
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• 2011

경남지역 과수원 토양 25개소를 대상으로 2010년에 토양 화학성분과 미생물 다양성을 검토하고 토성, 지형 및 작물별 주요 변동요인을 주성분분석으로 해석하였다. 토양 유효인산 및 치환성 칼륨 함량은 적정수준 보다 각각 2.6배 및 2.3배 높았으며 대부분 토양 화학성분의 최소값과 최대값 차이가 크게 나타났다. 지형적으로 산록경사지는 토양 유효인산 함량이 유의적으로 높았고 (p<0.05) 미사질양토에서 곰팡이와 형광성 슈도모나스균 개체수가 사양토 보다 유의적으로 높았다 (p<0.05). 주성분 분석결과 제 1주성분이 28.4%, 제 2주성분이 20.1%로서 전체 48.5%의 자료를 설명할 수 있었으며 제 1주성분은 토양의 세균 개체수가 가장 크게 기여하였다. 토양 유기물 함량은 곰팡이 개체수와 정의상관을 보인 반면 세균 개체수와 부의상관을 나타냈다.

• Biotechnology and Bioprocess Engineering:BBE
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• 제4권1호
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• pp.41-45
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• 1999

Microbial cellulose has many potential applications due to its excellent physical properties. The production of cellulose from Acetobacter xylinum in submerged culture is, however, beset with numerous problems. The most difficult one has been the appearance of negative mutants under shaking culture conditions, which is deficient of cellulose producing ability. Thus genetic instability of Acetobacter xylinum under shaking culture condition made developing a stable mutant major research interest in recent years. To find a proper type of bioreactor for the production of microbial cellulose, several production systems were developed. Using a reactor system with planar type impeller with bottoms sparging system, it was possible to produce 5 g/L microbial cellulose without generating cellulose minus mutants, which is comparable to that of static culture system.

• Natural Product Sciences
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• 제25권2호
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• pp.92-102
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• 2019

Centella asiatica (Linn.) Urban (Umbelliferae) which is also known as 'pegaga' is highly consumed and eaten raw as 'ulam' in Malaysia. C. asiatica is used in traditional medicines to treat various health conditions such as rheumatism, inflammation, syphilis, skin diseases and diarrhoea. Various reports exhibited that the crude extracts and isolated bioactive compounds of C. asiatica possessed a broad range of pharmacological activities such as anti-oxidant, anti-diabetic, anti-tumor, wound healing, anti-microbial, anti-inflammatory, immunomodulatory, hepatoprotective and memory enhancing properties. The pharmacological validation on anti-microbial and immunomodulatory of C. asiatica is very limited and several existence review papers related for this plant had not been focused for both activities. This review therefore attempts to combine the existing literature to offer immense scope for researchers engaged in validation of the traditional claims and bioactivities of this plant related with anti-microbial and immunomodulatory potential.

• 한국토양비료학회지
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• 제34권1호
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• pp.8-16
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• 2001

미생물제 비료시용이 배추의 생육과 토양의 화학성 변화 및 미생물상에 미치는 영향을 포장시험으로 실시하였다. 대조구에 비하여 TLB미생물제 비료를 시용함으로써 배추의 생육은 양호하였으며, 배추수량에 있어서도 유의성 있는 증수 효과를 보였다. 그러나 TLB미생물제 비료를 시용하더라도 배추생육시 요소비료의 추비량 및 퇴비 시용량을 줄일 경우에는 대조구에 비하여 수량이 다소 감소하는 경향을 보였다. 토양의 화학적 성질에 미치는 TLB 미생물제 비료 시용의 효과는 대조구에 비하여 수확기의 토양유기물 함량의 감소가 가장 큰 것으로 나타났고, 토양중 전질소 함량은 0.76~1.44% 범위로 대조구보다 오히려 미생물제 비료 시용구가 감소하는 경향을 보였다. 토양중 유효인산 함량은 시험전 토양의 559ppm에 비하여 배추의 수확기에 대조구 755ppm 그리고 미생물제 시용구 653ppm으로 대조구와 비교하여 미생물제 시용으로 인하여 다소 낮은 편이었다. 한편 배추 수확 후 배추의 화학적 성분은 전 질소 2.62~2.94%, 인산 1.48~1.55%, 칼리 3.60~4.38%범위이었으며, 각 처리간에 함량의 뚜렷한 차이는 없었다. 토양 미생물상중 전세균수는 대조구보다 미생물제 시용으로 다소 감소하였으나, 배추수확기 토양에서 Pseudomonas속이 3배 이상 높은 군락을 보였다. 그러나 방선균은 큰 차이를 보이지 않았지만, 사상균수는 수확기 토양에서 미생물제 비료 시용으로 현저히 높은 군락을 형성하였다.

• 한국축산식품학회지
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• 제37권4호
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• pp.606-616
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• 2017

The objective of this research was to investigate the effects microbial transglutaminase (mTGs) on the physicochemical, microbial and sensory properties of kefir produced by using mix cow and soymilk. Kefir batches were prepared using 0, 0.5, 1 and 1.5 Units m-TGs for per g of milk protein. Adding m-TGs to milk caused an increase in the pH and viscosity and caused a decrease in titratable acidity and syneresis in the kefir samples. Total bacteria, lactobacilli and streptococci counts decreased, while yeast counts increased in all the samples during storage. Alcohols and acids compounds have increased in all the samples except in the control samples, while carbonyl compounds have decreased in all the samples during storage (1-30 d). The differences in the percentage of alcohols, carbonyl compounds and acids in total volatiles on the 1st and the 30th d of storage were observed at 8.47-23.52%, 6.94-25.46% and 59.64-63.69%, respectively. The consumer evaluation of the kefir samples showed that greater levels of acceptability were found for samples which had been added 1.5 U m-TGs for per g of milk protein.

• 한국식품위생안전성학회지
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• 제12권2호
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• pp.111-116
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• 1997

For the purpose of improving hygienic quality of dried-Angelica Keiskei Koidz powder, the effect of ozone treatment and gamma irradiation on the microbial decontamination and physicochemical properties were investigated. Gamma irradiation at 5 to 7.5 kGy resulted in sterilizing total aerobic bacteria, molds and coliforms below detective levels, while ozone treatment for 8 hours up to 18 ppm did not sufficiently eliminate the total aerobic bacteria of the sample. The physicochemical properties of the sample were not changed by gamma irradiation up to 7.5 kGy, whereas, ozone treatment caused remarkable changes in pH, TBA value, chlorophyll, carotenoid and fatty acid compositions. Therefore, this investigation demonstrated conclusively that gamma irradiation was more effective than ozone treatment for decontaminating and sterilizing the dried-Angelica Keiskei Koidz powder, with minimal effect on the physicochemical properties analyzed.

• 한국염색가공학회지
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• 제18권5호
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• pp.8-14
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• 2006

An earthworm protease, Lumbricus rubellus, was used to improve the dyeing properties of protein fibers such as wool and silk. The optimal condition for the activity of the earthworm pretense was about $40^{\circ}C$ at pH 7. The wool and silk were treated with the protease extracted from an earthworm and the K/S values of the dyed wool and silk were measured using a spectrophotometer in order to compare the dye uptake. The pretense treatment enhanced the dyeing properties of protein fibers without severe changes in mechanical properties. The surface appearances of pretense-treated fibers were observed by microscopy analysis.